﻿using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Collections;

namespace ConferenceSystem
{
    public abstract class cl_0423_SystemSubject
    {
        protected ArrayList employees = new ArrayList();

        public abstract void notice();
        

        public void attach(cl_0423_EmployeeObserver employeeObserver)
        {
            employees.Add(employeeObserver);
        }

        public void detach(cl_0423_EmployeeObserver employeeObserver)
        {
            employees.Remove(employeeObserver);
        }
    }
}